memcg: avoid dangling reference count in creation failure.
When use_hierarchy is enabled, we acquire an extra reference count in our parent during cgroup creation. We don't release it, though, if any failure exist in the creation process. Signed-off-by: Glauber Costa <glommer@parallels.com> Reported-by: Michal Hocko <mhocko@suse.cz> Acked-by: Michal Hocko <mhocko@suse.cz> Cc: Tejun Heo <tj@kernel.org> Cc: Hiroyuki Kamezawa <kamezawa.hiroyuki@gmail.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -6196,6 +6196,8 @@ mem_cgroup_css_online(struct cgroup *cont)
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* call __mem_cgroup_free, so return directly
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*/
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mem_cgroup_put(memcg);
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if (parent->use_hierarchy)
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mem_cgroup_put(parent);
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}
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return error;
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}
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